645234 has 16 divisors (see below), whose sum is σ = 1332480. Its totient is φ = 208080.

The previous prime is 645233. The next prime is 645257. The reversal of 645234 is 432546.

645234 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (645233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1549 + ... + 1920.

It is an arithmetic number, because the mean of its divisors is an integer number (83280).

2⁶⁴⁵²³⁴ is an apocalyptic number.

645234 is an abundant number, since it is smaller than the sum of its proper divisors (687246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645234 is a wasteful number, since it uses less digits than its factorization.

645234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3505.

The product of its digits is 2880, while the sum is 24.

The square root of 645234 is about 803.2645890365. The cubic root of 645234 is about 86.4116732342.

The spelling of 645234 in words is "six hundred forty-five thousand, two hundred thirty-four".